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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c39467bdd08185b53e2b922e5777dc08b23ef2fa1c524a91391739e03c2152d' 
  AND token = '/s7pjNdUb6SoXqbaRjqNL7sX5rNak4Acfp/DESTS+18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}